The principle of association, as every one knows, involves that whenever two things have been associated sufficiently together, the suggestion of one of them to the mind shall immediately raise a suggestion of the other. It is in virtue of this principle that language, as we so call it, exists at all, for the essence of language consists, as I have said perhaps already too often, in the fixity with which certain ideas are invariably connected with certain symbols. But this being so, it is hard to see how we can deny that the lower animals possess the germs of a highly rude and unspecialised, but still true language, unless we also deny that they have any ideas at all; and this I gather is what Professor Max Muller in a quiet way rather wishes to do. Thus he says, "It is easy enough to show that animals communicate, but this is a fact which has never been doubted. Dogs who growl and bark leave no doubt in the minds of other dogs or cats, or even of man, of what they mean, but growling and barking are not language, nor do they even contain the elements of language." {18} I observe the Professor says that animals communicate without saying what it is that they communicate. I believe this to have been because if he said that the lower animals communicate their ideas, this would be to admit that they have ideas; if so, and if, as they present every appearance of doing, they can remember, reflect upon, modify these ideas according to modified surroundings, and interchange them with one another, how is it possible to deny them the germs of thought, language, and reason--not to say a good deal more than the germs? It seems to me that not knowing what else to say that animals communicated if it was not ideas, and not knowing what mess he might not get into if he admitted that they had ideas at all, he thought it safer to omit his accusative case altogether.